Portable lamp



FIG. 1 is a top perspective view of the portable lamp in accordance with the design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is another side elevational view thereof that is taken from the right of the view in FIG. 3;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines show portions of the article not claimed and form no part of the claimed design. 

CLAIM The ornamental design for a “portable lamp,” as shown and described. 